Coal mining machinery



July 2, 1935. F, B. YlNGLlNG COAL MINING MACHNERY Filed Aug. l2, 1952 9Sheets-Sheet l July 2, 1935. .r- B. YINGLING 2,006,379

COAL MINI-NG MACHINERY y Filed Aug. l2, 1932 9 Sheets-Sheet 2 /A/ VEN TaFRA/wr B. w/vsl. uva.

July 2, 1935. F. B. YINGLING 2,006,379

COAL MINING MACHINERY FiledA Aug. 12, 1932 9 sheets-sheet 5 FRAN/f B.Y//V6L//Y6. BY l c A T TUE/VE )'15 July 2, 1935. F. B. YINGLING COALMINING MACHINERY Filed Aug. l2, 1952 9 Sheets-Sheelfl 4 A, /N VEN ToexHIMW//f/ July 2, 1935.

F. B. YINGLING COAL MINING MACHINERY Filed Aug. 12,' 1952 9 Sheets-Sheet5 EGE! July z, 1935.L

F. B. YINGLING COAL MINING MACHINERY Filed Aug 12, 1932 V 9 Sheets-Sheet6 July 2, 1935. l

F. B. YINGLNG COAL MINING MACHINERY -9 Sheets-Sheet '7 FileCYAug. l2,1932 /N VEN T02 5 6 E N, w w A K/ y am July 2; 1935.

F. B. YINGLING COAL MINING MACHINERY Filed Aug. 12, 1932 9 Sheets-Sheet8 .mmdmlp am uw u Na. e. Ew w j www? vhf/8 .A Nn Y. ,Jv s Q Mh rb ll-July 2, 1935. F. B, YINGLING COAL MNING MACHINERY Fileia Aug. l2, 1952 9Sheets-Sheet 9 -f @L @www UTSTl.. GW/TST Patented July 2, 1935 PAT OFFICOAL MINING MACHINEY `Frank B. Yingling; Hamilton, ohi, assigdrto CyrusJ. Fitton, Hamilton, Ohio Applicationnugust 12, y193,2, serial No.628,572

1s Claims. (o1. v26e- 7.28)

r'I'his invention relates to improvements in coal mining machines, andhas forits object toprovide a coal mining machine-with a cutter barwhich may be positioned and operated in any position froman upperhorizontal one to a lower horizontal one, and may swing through an angleof atleast 180 degrees, aswell as have a capacity for cutting Aatvarious angles in a vertical plane. It is also an object of thisinvention to provide,

in connection with acoal mining machine, meansy for supporting a cutterbar and operating it at various angles to the horizontalr and tothever.-

tical. f v

It is also an object ofjthis invention to provide, in connectionwithacoal mining machine, means for supporting a cutterv bar in ahorizontal position and operating vand-adjustingv the cutter bar throughan angleof 180 degrees `when so positioned as well as in variousvertical positions.

It is a further object of this invention toY provide, in connection withmeans for variously adjusting the position of the cutter bar,electrically operated brakes for-holding the bar in any adjustedposition, and toprovide electrically operf ated clutch mechanism forconnecting the oper- Vbeing so interconnectedfthat when one is operatedthe other is idle'. f

lThese and other advantages willfappear from the following descriptiontaken in connection with ,the-drawings. y

Referring to the drawings: Figure 1 `is a top plan View of the coalmining machine.

Figure 2 is a vertical longitudinal section ythrough the machine asshown in Figure 1.l

v Figure 3 is a section onthe line 3-3 of Figure 2. 40 Figure yFigure 2.f

Figure 5 isa sectionv Figure 2. Figure 6 is Figure 2. f

Figure 7 shows three switches that interlock with the hand controls tooperate two small motors ron the link for operating theclutchesvandapplying the brakes, one for each end mechat nism of the link and onefor operating the rapid transverse movementsv of the cutter bar. Figure8 shows one of the five electric controllers for operating the motor formoving the truck, for rotating thecutter har, for 'moving 4 is asectionL en the line 4 4 bf on the line a section on the une I6 6 ,f

Ytlie link. ating parts of the mechanism to a source of power, V theclutch mechanism and the brake mechanism jnecting the cutter bar to thetruck.

Athe linkto deflect the cutter, bar and forl swiveling .the cutter bar,andY one for lthe cutter drive.

Figure 9 shows the rotating motor and the connection between the motorand the rotating head.

Figure 10A is asectionv onthe line |0-I0 of 15 Figure9.` v :H

Figure `11 is a ew showing the-'motor and.` a" section throughthe gearmechanism for rotating the cutter chaindrive.` I l c f,

Figure1f12 is a 'section on-'the linel2+|2 of Fgurell. n I *Y Figure 13is a topplan view of'the link connection between the truckbody and thecutter .bar.` Figurey 14 shows the motor and'one form of 'gearlmechanism for operating the clutches." f Figure l5 is a top plan viewof the forwardend of the link-and `the swiveledhead of the cutter' bar..Figure 16'is a section on'the line ll--Il of Figurel; Figure 17 showsthe motor, the gear operated` thereby and the housing for inclosing thegear that swings'. the cutter bar on the `front end v of f `l'igure 18is a vertical section through the swivel head of the 'cutterbar and thefrontend of the link Asupporting the cutter bar.

Figure 19 is atop planview of the cutterbar, yparts thereof being'brokenaway.` Figure 20 is atop plan' view of the connection between thefrontend of the link and the rear end of the cutter. bar. Figure 21 is asection onthe line 2 I`2 I f of Figure20.v f

Figure 22 is a vertical section through the head casing supportingtherrear` end of the cutter bar.

shownin Figure 22. 'f

1 Figure 25 is a sideelevation of the link for con- Figure 26 .Figure25. v f. l

Figure 27 is a top plan viewjof one end of the clutch` and brakeoperating motor'and.y the clutch lever operated thereby.

Figure 28 is a section onthe line 28--28 of Figure 27.

Figure 29` is a view similar to Figure 27, but showing the connectionbetween 4the motor shaft andthe clutch lever in section. Y

is a section" on the line 26,-26 of Figure 30 is a section on the line30-30 of Figure 29.

The present coal mining machine is adapted to be transported on atrackway A, which consists of a body or chassis having a door I, sides 2and a front head member 3, all formed integral with one another. Thebody is supported in the present instance by two axles 4, each of whichhas on each-enda wheel 5. On each axle betweengthe Wheels i's .a wormg'ear `@meshing with a Worm 1 on a longitudinal shaft 8.

This shaft is vdriven by means of a motor 8, through a clutch mechanismconsisting` ofa clutch element IB aixed to one end of the lshaftfand asecond clutch element I I slidably mounted on the motor shaft butadapted to engage Athe clutch ele,- ment I on the end of the shaft 8.The clutch element I I is slidable upon the shaft of the motor by meansof a lever I2, suitably pivoted to some part of the body and connectedat one end to one end 'ora `link I3, which has'its other end connectedto aclutch operating -lever :I4 pivoted to the floor. l

This motor and its cooperating shaft and 'clutchV members will propel`the body along the track. In the rear end of the'body and transverselythereof is' amotor I5, which yhas on its 'shaft a Worm .|61 engaging ona worm gear I1 located on a longitudinally disposed shaft I8 at one"sidetof the `body. lThe Worm gear I1 is at one end of this shaft I8while on its other end theresisapinion lsfwhibh engages an internalrgear llforned oh a rotating head.

This head has a rearwardly extending hub 2I, which 'projects intoa-suitable bearing formed in thehead 3. ABy means vof the shaft I8andthe lpininIS onthe end thereof engaging the internalgear Ahead,v the4head may be rotated about the bearing for the hub 2 I.

Around the periphery of the gear head .is a casing 22, somewhatrectangular in shape, and which has located in each corner a roller orlbea-ring' 22a which servesY to g'uide and stabilize Athe movement ofthe head due to the operation of the head-driving motor and shaft.Centrally located inl the body between the side walls is a third motor3-, which has the usual motor shaft and a pinion 24 on the end thereofengaging an internal gear 2li` mounted upon a shaft 26 supported in asuitable bearing provided therefor in the head 3. The end of the shaft`2li, remote from 4the internal gear 25, has thereon a pinion 21 whichis located within the internal gear head and engaging the outer gearVteeth on a gear` 28 supported for rotation on the shaft or spindle 2I.vThis'gear 28 has internal teeth which mesh ,withapinion 2S located onone end of ya shaft v43,0-,'-.jourhalled in' a bearing 3I 'formed .onthe .frontsideof the gear vhead 28;` 'On the` other end of the shaft 30is a bevel gear 432. which'meshes supported by the 'link strutture.Meshihg .with

'the-bev'e'l-geai '138 ,another bevel gear 38 lo,- cated on one `end "ofa v` longitudinally extending ing the shaft 43.

"easing, with a boss B1 between the arms.

shaft 40, which is supported by means of the cross bars 38 of the linkstructure.

On the other end of this shaft 40 is a bevel gear 4I which meshes with abevel gear 42 located on a shaft 43. This gear 42 also meshes with agear 44 located on a vertically disposed shaft 45. This shaft is shownto be vertical in both Figures l and 2, but may during the operation ofthe machine assume other positions.

While only one shaft I3 has abevcl 'gear thereon, there are two of theseshafts, each supported by the front end of one of the sides of the linkstructure. Supported on the front ends of these head consisting o f sideplates 46, an Lipper plate i9 `and a lower plate 50 connecting the twoside plates. In each side plate is a hole 41 for receivohcentricallywith the shaft 4 3 andequally spaced from each shaft on each side plateare teeth 48 adapted to be engaged by means or a worm gear, lat-entetedescribed, folftil'tin'g the swivel headoh thel shafts 4'3.

sf the pistes as and in has a hole 5| therein whiehjthe shaftl'sfrotte's, and is Ksupported by means of suitable bearings. The frontedge of the upper' plate has teeth 5'2 adapted to be engaged by apihiohfor 'rotating' the cutter hai, later to be described.

fineiosihg the front edge et the swivel head is a. easing eoiisisting ofan 'upper plate 53, a'lo'wer pla-tell and .a verticaiconnecting wail545. The upper'end of this' vertie'al wall Vis horizontally disposed, asindicated by the numeral 58, to provide aho'usi'n'gr for fapi'nion 58located on the upper end of e shaft 51. This shaft is located ih'suitable bearings inthe plates 53 and 54, in front of 'the'vertieaipartition-er 'wail 55.

f Unlthe lower end of thefshaft 51 is a worm gear 58 for rotatingthe-Shaft 51 and the pinion 58 on the 'upper enti thereof. This pinion58 engages with the teeth t2 on the 'front ofthe plate le for 'swingingthe cutter bar' about the v'rtiel shaft 45. yThis Wormis located in ahoussn Vheated beneath the plate 54, and is opersheet This cutter 'hat'consistsiargeiy of' two .epaeeeahhs connected at ihtervaisrby means ofcross bars E5. Near the rear of each arm is a plurality of elongatedholes 66 adapted t Ci'V bll'fs fbi 'S'lipp''lti'g and holding 'thecutter bar in a xed position upon the top of the i `easing supported onthe swivel head. The (rear ends of the 'arms'are supported 'o'n the topof the This boss is formed integral with the upper plate 53. Located onthe upper end of 'the shaft l5 is a sprocket wheel 1I), which togetherwith the sprocket wheel SS--located in thefront end of the cutter bar,support a` sprocket chain 1I for `I-fotation around theperiphery of -thecutter-bar.

This chain carries thereon a plurality of blades or knives 12, usedfortherpurpose 'of loosening the coal or cutting a way throughs, stratumof coal.

In order-to properly adjust and position the cutter bar on its support`there is provided a screwjt, which passes'through the rearmost crossbar 65, into the boss $1-,l as clearly shown in Fig ure 18.k Thisscrewis held in adjusted position by means of nuts 13a.

1 On the yfrontend of the casing which'supports 'the 'rear end of thecutter bar are cutter bar shaft sibeneaththe part te.

Integral with the pinion 14 and the bevel gear 19 is aclutch member 80.Between these clutch members and slidably mounted on the shaft 51 is acooperating clutch member 8| adapted to engage either of the clutchmembers for causing the pinion 14 or the gear 19 to rotate with theshaftfl. The bevel gear 15pinion 1S, the bevel gear 'I6 and the pinion'I1 are supported by means of lstub shafts 82 supported by a frontvplate 83. l

In the construction shown in Figure 23, instead of having the bevelgears 15 and 18 vand their associated pinions 16 and 11, the pinion 14a,as

shown in this gure, engages thegear 15a. mount-,

ed on a vertical shaft 16a, which has adjacent its upper end a pinion11a meshing with a gear 18a located at the upper end of the shaft 51.The pinion 'Ifla and the gear 18ct have a clutch member lla similar tothat shown in Figurel.

`These clutch members are adapted tobe en-r gaged by a sliding clutchllas-mounted upon the shaft 51 for rotationtherewith. rThe clutches 8land Sla are operated by a clutch lever 82a, as shown in Figure 16.

`For elevating the cutter barand the link structure connecting thecutter bar to the truck, a mo tor 3d is supported `on the linkstructure, beneath a platform 85. This motor has a shaft 8G, Awhichrextends. from both ends'thereof. and has on its.

rear end a bevel gear 81 andY on its front end a bevel gear SS. Thebevel gear |31 meshes with a bevel gear 89 located ona transverselyextending shaft 90, suitably `supported in some bearings in the linkstructure. y c

The bevel gear' v88 meshes with a bevel gear 9| located on atransversely extending shaft 02 par allel to and supported in the samemanner as shaft Q0. On' each end of the shaft 90 isa bevel gear 93, eachof which engages a bevel gear 93d located on the lowerend of a verticalshaft 94, supported on one of` the side bars 31 of the link structure.

In order to accommodate a Worm the side of the link structure is cutout, as indicated by the numeral 95. At the top of the shaft 94 on themember 31, and integral therewith, is a clutch element 91 which issomewhat saucer-shaped and has cooperating therewith a clutch element98,

located on the reduced end 99 ofl the vertical I shaft 911|. This clutchelement 98 is loosely mounted upon the reduced end 99 so that it maylhave a slight vertical movement but will rotate with the shaft. Thereare two of these worms 06, meshing with the teeth 3B 'on' one of thebrackets 35. c

On each end of shaft 92 is a bevel gear |60 which meshes with a gear I0I on a vertical shaft |02, which is constructed and operated similarlyto the shaft gli, but instead of being located near f structure, at thetop of .each shaft |02, is a clutch element |04 similar to thev clutchelement .91, and

lwhich has attached thereto a" cable |28. 'reel is on a shaft |29,suitably' supported in one has cooperating therewith a. clutch element.`|05. By operatingthe motor 84 the wormsSB and |03 may rotate for `thepurpose of tilting the link structure or for the purpose ofelevating'the cutn ter bar. l and the cutter bar are controlled by abrake and clutch mechanism, 'about to be described.

Suitably located' in the link structure are two motors |06, each havinga `shaft |01. One of these motors is used Ito operate the clutch and thebrake mechanism usedV in connection with the operation of the worms 96.The other is used in connection with the operation of the worms |03..Both operate on the same type of mechanism for producing the sameresults, and therefore the description of one set of mechanism willapply to the other set of mechanism. The same reference characters areused for the correspending parts connected with each motor.

Located. on each motor shaft, which is threaded, is a trunnion nut I8which is pivotedvr to the forks of a fork lever |09, suitably mountedupon a shaft II which extends transversely of the link structure. l Thenumeral I I I` is used to des# ignatea lever bracket for operating theswitch control. The Vswitch operating plunger I I2 is providedinconnection with the lever bracket for making and breaking a contact withswitches II3, inclosed within asuitable switch housing |I4.

Extending through the fork lever and 'the lever bracket is a retainingbolt I I5. The lever bracket is located on the shaft ||0 and hasextending therefrom yor attached to the shaft an arm IIE. There are twoof these arms, one at each end of the shaft IIIl.y The swinging of thisarmwill cause the operation of the clutch members and the brakingapparatus; vAs the motor shaft rotates in one'direction the lower endofv the arm IIS will swing-in one direction, and on therotation of themotor shaft in the other direction the arm IIB will swing in theyreverse direction.

One karm IIvis connected to a brake 'lever I I1, while the other armisconnected to a clutch lever I I8 by means of a suitable link connectionII9. rThe clutch leversare used for the purpose of sliding a clutch |20located on the shaft 90 and onthe shaft 92.' These clutches, one on eachof these shafts, are for the purpose of causing the bevel gears 3s and9|, whichv are loosely mounted 'on the shafts, tofrotate with theshafts.

will be released.

Instead ofhaving the'shaft on the motor 84 continuous it may be'broken,as shown in Figure 14, with the shaft extending from one end'to operatel the bevel gear 88. rlhis shaft also operates through gears I2I, ashaft |22, which operates `through gears |23 a small shaft I2carryingthe bevel gear 81. By this means both gears 81 and 88 rotate in unison.lAs indicated in Figure lll,

"if Idesired a speed reducingl mechanism operated through a shiftingclutch may be employed.

The movements of the link structure On the lefthand side of the truck isal platform I 25, upon which the operator stands for manipulatingcurrent-controlled levers I 26. On the other side of the truck orvehicleis a cable reel |21, This side .of the truck, .andv has on itsinner end a sprocket wheel |30 which has aroundit a sprocket chain Iii,which passes around. a sprocket wheel [32x located upon one of the axles4. This axle 4 is the one by which the truck is driven along thetrackway. Throughthe rotation of this axle 4 the cable, reel |21 iscaused` to rotate.

In Figure 8 there is shown one of the iive electric controllers foroperating the motor, as above described, one for moving the linkstructure to deflect the cutter bar in various planes, one for swivelingthe cutter bar, and one for the cutter drive.

The details of the wiring form no part of the present invention.

In Figure 7 three switches are shown that intei-lock with the handcontrollers to operate the two small motors on the link struct-ure foroperating the clutches, and applying the brakes, one for each endmechanism of the link structure, and one for operating the rapid reverseof the cutter bar when required.

It will be understood that it is desired to comprehend within thisinvention such modifications as come within the scope of the claims andthe invention.

Having thus fully described my invention, what I claim as new a-nddesire to secure by Letters Patent, is:

1. Inl a coalmining machine, a chassis, means for moving the chassisWith respect to the ground, a rotatable supporting head thereon, saidhead having a hub, means on the chassis for rotating the head, a cuttercarried by the head, and means on the chassis for driving the cutterirrespective oi the rotative position of the head, said lastnamed meansincluding a gear mounted on the hub.

2. In a coal mining machine, a chassis, means for moving the chassiswith respect to the ground,

a rotatable supporting head thereon, said head having a hub, means onthe chassis for rotating the head, a cutter carried by the head,rmeanson the chassis for driving the cutter irrespective of the rotativeposition of the head, said lastnamed means including a gear mounted on`the hub, and means for adjusting the cutter to different angularpositions.

3. In a coal mining machine, a chassis, means for moving the chassiswith respect to the ground, a rotatable supporting head thereon, saidhead having a hub means on the chassis for rotating the head, a cuttercarried by the head, means on the chassis for driving the cutterirrespective of the rotative position of the head, said last-named meansincluding a gear mounted on the hub,and meansto adjust the cutter todifferent elevations.

4. The combination in a coal cutting machine of a chassis having a headmember having a cen- .trai bearing, means for driving the chassis withrespect to the ground, a rotatable head mounted on the chassis andhaving a hub projecting into the bearing, means on the chassis forrotating 'the head, cutter driving means on the chassis extendingthrough the head to a cutter, said driving` means including a gear onthe hub, and a cutter mounted on the head.

5. The combination ina coal cutting machine of a chassis, means fordriving the chassis with respect to the ground, a rotatable head mountedon the chassis, means on the chassis for rotating the head, cutterdriving means on the chassis Aextending through the head to a cutter,said ydriving means comprising a gear rotatably supported by the headand engaging two other gear members, a cutter mounted on the head, andmeans to adiiust in aA horizontal plane the cutter about a vertical axiswith respect tov said head.

6. The combination in a coal cutting machine of a chassis, means fordriving the chassis with respect to the ground, a rotatable head mountedon the chassis, means on the chassis for rotating the head, cutterdriving means on the chassis extending through thefhead to a cutter, acutter mounted on the head, means to adjust in a horizontal plane thecutter about a vertical axis with respect` to said head, and means toadjust the angular position of the cutter with respect to the head, saidlast-named means including a link structure having .thereon a motor anda gear mechanism operated by the motor.

7. The combination in a coal cutting machine of a chassis, means fordriving the chassis with respect to the ground, a rotatable head mountedon the chassis, means on the chassis for rotating the head, cutterdriving means on the chassis extending through the head to a cutter, acutter mounted on the head, means to adjust in a horizontal plane thecutter about a vertical axis with respect to said head, means to adjustthe angular position of the cutter with respect to the head, and meansto adjust the elevation of the cutter with respect to the head, saidlast two means including a link structure having thereon a motor` and agear mechanism operated by the motor.

8. In a coal mining machine, a chassis having supporting front wall, aninternal gear pivotally mounted on said iront wall guided and supportedby rollers at spaced points on the external portion of said gear, amotor, and driving means connected thereto engaging with said internalgear to rotate it, a second motor, drive mechanism driven therebyextending to a point adjacent the interior of said ring gear, and meanscarried by said ring gear extending therebeyond for driving a coalcutter adapted to be driven by said second motor, said driving meanscomprising an internal and an external gear mounted on `the pivot ofsaid rst mentioned internal gear.

9. In combination in a coal mining machine, a chassis, rollers on theend thereof, an internal ring gear mounted with said rollers, meansengaging said gear for rotating it, a hub extending into the chassis forpivotally supporting said ring gear on said chassis, cutter drivingmeans carried by said ring gear, means for actuating said cutter drivingmeans carried thereby from a point on said chassis to a point beyondsaid ring gear, and cutter means driven thereby mounted on saidringgear.

10. In combination in a coal mining machine, a chassis, rollers on theend thereof, an internal ring gear mounted with said rollers, meansengaging said gear for rotating it, a hub extending into the chassis forpivotally supporting said ring gear on said chassis, cutter drivingmeans carried by said ring gear, means for actuating said cutter drivingmeans carried thereby from a point on said chassis to a point beyondsaid ring gear,

i cutter means driven thereby mounted on said ring gear, and means toadjust said cutter in horizontal planes, vertical planesv and todifferent angular positions.

11. In a coal mining machine, a chassis, a rotatable support mountedthereon for a coal cutter, a coal cutter, a head therefor pivoted on thevertical axis, a link pivotaliy connecting said head of the cutter tosaid rotatable head, gearing on said cutter head and rotatable head,gearing on said link engaging therewith,` means for alternately drivingsaid gearing to change the elevation and angular position of saidcutter, means on said cutter head for rotating said cutter about itsvertical axis, and brake means on said link for controlling said gearingand the positioning of said link, rotatable head and cutter head.

12. In a coal mining machine, a chassis, a rotatable head on one endthereof having a projecting supporting bracket with a segmental gearthereon, a link pivoted on said bracket, gearing on said link engageablewith said segmental gearing, a cutter head mounted on the free endpivoted thereon, said cutter head having asimilar segmental gear pivotedthereon for changing the angular position of the cutter head withrespect thereto, motor means on said link for alternately actuating saidgears, and brake means for maintaining said link, bracket and head inpredetermined positions. v

13. In a coal mining machine, a chassis, a rotatable head on one endthereof having a projecting supporting bracket with a segmental gearthereon, a link pivoted on saidv bracket, gearing on said linkengageable with said segmental gearing,

a cutter head mounted on the free end pivoted thereon, said cutter headhaving a similar segmental gear pivoted thereon for changing the angularposition of the cutter head with respect thereto, motor means on saidlink for Lalternately actuating said gears, brake means for maintainingsaid link, bracket and head in predetermined positions, and means onsaid cutter head for rotating said cutter about a vertical axis.

14. In a coal mining machine, a chassis, a rotatable head'on one endthereof. having a projecting'supporting bracket with a segmental gearthereon, alink pivoted on said bracket, gearing on said link engageablewith said segmental gearing, a cutter head mounted on the free endpivoted thereon, said cutter head having a similar segmental gearpivoted thereon for changing the angular position of the cutter head,with respectk thereto, motor means on said link for alternatelyactuating said gears, brake means for maintaining said link, bracket andhead in predetermined positions, means on said cutter head for rotatingsaid cutter about a vertical axis, and means on said chassis passingthrough said rotatable head,

bifurcated link pivoted between said brackets having gearing engagingwith the brackets, gearing for adjusting the angularity of the'link withrespect thereto, a cutter head having vertically-disposed spacedsegmental gears engageablek with gearing on said link for adjusting theangular position of said head on the link, a cutter on said cutter head,means on said chassis for driving through said rotatable head, bracket,link and cutter head of said cutter, amotor on said link for actuatingthe gearing thereon, a motor on said cutter head for rotating the cutterabout a vertical axis, and brake mechanism on said link for maintainingsaid linkin its adjusted positions.

16. In a coal mining machine, in combination with a chassis'havingthereon a rotating head and `a cutter head having thereon a cutter bar,means connecting the rotating head to the cutter head` comprising a linkstructure having thereon a gear kmechanism operatively connected to therotating head for elevating the link structure, a second gear mechanismoperatively connected to the cutter lhead for elevating the cutter bar,power means `a brake for eacliworm, and means for simultanecusly causingcertain of said worms to be braked and disconnected from the motor. i

18. In a coal mining machine, in combination with a chassis andacutter'bar, a link mechanism for connecting the cutter bar tothechassis, means on the link mechanism for swinging the link mechanismin relation to the chassis, means on the link mechanism for swing thecutter bar in relationr means for causing said means to operate inconjunction or independent of each other, and means automaticallyoperated for cutting out the electrically operated means at certainperiods in thev operation thereof..

FRANK B. YINGLINCT.v

